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                    Maven 使用笔记
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                            2017-09-21 10:32
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                                <a href='/categories/study-notes'>学习笔记</a>

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  <blockquote> 
   <p>前两天做项目的时候，偶然知道了Maven这个工具，据说可以非常方便的管理JAR文件，和生成War包等操作。于是乎，就花了点时间在项目中使用了Maven。下面就简单的记录一下使用心得。</p> 
  </blockquote> 
  <h2 id="管理jar包">管理JAR包</h2> 
  <p>这个功能简直好用到爆......起初做项目的时候，遇到需要使用JAR包的时候，百度各种找......比如在IDEA中是不集成JSTL标签库的，于是乎就得去网上找JAR包，找到了之后，下载也特别麻烦，不是要注册就是要积分，搞得很头疼。但是如果使用Maven的话，我只需要在<code>pom.xml</code>中配置一下就自动下载到Maven本地仓库而且可以直接使用了。如：</p> 
  <pre><code class="language-xml">&lt;dependency&gt;
&nbsp;&nbsp;&lt;groupId&gt;jstl&lt;/groupId&gt;
&nbsp;&nbsp;&lt;artifactId&gt;jstl&lt;/artifactId&gt;
&nbsp;&nbsp;&lt;version&gt;1.2&lt;/version&gt;
&lt;/dependency&gt;
&lt;dependency&gt;
&nbsp;&nbsp;&lt;groupId&gt;taglibs&lt;/groupId&gt;
&nbsp;&nbsp;&lt;artifactId&gt;standard&lt;/artifactId&gt;
&nbsp;&nbsp;&lt;version&gt;1.1.2&lt;/version&gt;
&lt;/dependency&gt;
</code></pre> 
  <p>当换电脑继续写项目的时候，也就不用再配置一次了，非常方便。</p> 
  <p>但是问题来了，当我在学校打开项目继续写的时候，那个下载速度简直比蜗牛还慢......本来学校的网就慢的出奇，Maven的中央仓库又在国外，直接导致下载速度异常的慢。</p> 
  <p>然后网上查了一下，可以把Maven中央仓库地址改为阿里的Maven仓库地址，只需要在Maven的settings.xml文件里的mirrors节点，添加下面的子节点：</p> 
  <pre><code class="language-xml">&lt;mirror&gt;
&nbsp;&nbsp;&nbsp;&nbsp;&lt;id&gt;nexus-aliyun&lt;/id&gt;
&nbsp;&nbsp;&nbsp;&nbsp;&lt;mirrorOf&gt;*&lt;/mirrorOf&gt;
&nbsp;&nbsp;&nbsp;&nbsp;&lt;name&gt;Nexus aliyun&lt;/name&gt;
&nbsp;&nbsp;&nbsp;&nbsp;&lt;url&gt;http://maven.aliyun.com/nexus/content/groups/public&lt;/url&gt;
&lt;/mirror&gt; 
</code></pre> 
  <blockquote> 
   <p>不得不说，阿里在Java技术方面确实很强大，之前我也了解过阿里的「<a href="https://github.com/alibaba/druid">druid</a>」这个连接池。据说是全世界第一的Java连接池，但是在我使用druid连接池的时候，并没有发现和其他连接池的区别，可能还是我太年轻了吧。在连接池这方面我还得下点功夫深入理解一下，顺便再了解一下高并发。</p> 
  </blockquote> 
  <p>在我使用druid连接池的时候，我是这样配置的：</p> 
  <p>在<code>pom.xml</code>中配置：</p> 
  <pre><code class="language-xml">&lt;dependency&gt;
&nbsp;&nbsp;&lt;groupId&gt;com.alibaba&lt;/groupId&gt;
&nbsp;&nbsp;&lt;artifactId&gt;druid&lt;/artifactId&gt;
&nbsp;&nbsp;&lt;version&gt;1.1.3&lt;/version&gt;
&lt;/dependency&gt;
</code></pre> 
  <p>在resources路径下的<code>druid.properties</code>：</p> 
  <pre><code class="language-xml">driverClassName=com.mysql.jdbc.Driver
url=jdbc:mysql://localhost:3306/examDB?useUnicode=true&amp;characterEncoding=UTF-8
username=root
password=123456
initialSize=1
minIdle=1
maxActive=2000
maxWait=60000
timeBetweenEvictionRunsMillis=60000
minEvictableIdleTimeMillis=300000
validationQuery=SELECT 'x'
testWhileIdle=true
testOnBorrow=false
testOnReturn=true
poolPreparedStatements=false
maxPoolPreparedStatementPerConnectionSize=20
filters=stat
</code></pre> 
  <p>然后在数据库连接工具类<code>DBUtil</code>中加载<code>druid.properties</code>：</p> 
  <pre><code class="language-java">//加载配置文件
Properties pr = new Properties();
//获取resources资源路径下的连接池配置文件
pr.load(this.getClass().getResourceAsStream("/druid.properties"));
DataSource dataSource = DruidDataSourceFactory.createDataSource(pr);
</code></pre> 
  <h2 id="生成war包">生成war包</h2> 
  <p>这个功能暂时还没怎么使用过，但也还是简单测试了一下。使用方法很简单，只需要在控制台输入<code>mvn clean package</code>或者直接在IDEA的Maven Projects中选择package就行了，接着在target就可以找到生成好的war包了。</p> 
  <p>我尝试上传到服务器上去，然后打开tomcat服务器就可以访问了。非常方便，但我还是觉得IDEA自动部署到远程服务器的功能更好用。</p> 
  <h2 id="结尾">结尾</h2> 
  <p>对于这样的工具简直是相见恨晚呐，不过目前对Maven的使用还不是特别溜，所以在以后的项目中就一直使用Maven构建和管理JAR包了。</p> 
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